======================================
| [  263.595716][    C1] 1 lock held by swapper/1/0:
| [ 263.595908][ C1] #0: ffffc900001c0d60 ((&icsk->icsk_retransmit_timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1737) 
| [  263.596297][    C1]
| [  263.596297][    C1] stack backtrace:
[  263.596538][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  263.596540][    C1] Call Trace:
[  263.596542][    C1]  <IRQ>
[ 263.596545][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 263.596551][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 263.596556][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 263.596561][ C1] ? add_lock_to_list (kernel/locking/lockdep.c:1409 kernel/locking/lockdep.c:1437) 
[ 263.596566][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 263.596571][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 263.596574][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 263.596578][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 263.596582][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 263.596586][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 263.596590][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 263.596596][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 263.596599][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 263.596604][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 263.596607][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 263.596610][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 263.596614][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 263.596618][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 263.596623][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 263.596626][ C1] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 263.596632][ C1] ? call_timer_fn (kernel/time/timer.c:1748) 
[ 263.596636][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 263.596639][ C1] ? handle_softirqs (kernel/softirq.c:580) 
[ 263.596642][ C1] ? __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 263.596646][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 263.596648][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 263.596652][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 263.596656][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 263.596659][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 263.596661][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 263.596663][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 263.596667][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 263.596670][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 263.596675][ C1] __put_net (net/core/net_namespace.c:732) 
[ 263.596679][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 263.596683][ C1] ? __pfx_tcp_write_timer (net/ipv4/tcp_timer.c:727) 
[ 263.596687][ C1] call_timer_fn (kernel/time/timer.c:1748) 
[ 263.596690][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1737) 
[ 263.596692][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1737) 
[ 263.596695][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1724) 
[ 263.596700][ C1] ? __run_timers (kernel/time/timer.c:1798 kernel/time/timer.c:2372) 
[ 263.596703][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 263.596707][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 263.596711][ C1] __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372) 
[ 263.596715][ C1] ? __pfx_tcp_write_timer (net/ipv4/tcp_timer.c:727) 
[ 263.596719][ C1] ? __pfx___run_timers (kernel/time/timer.c:2343) 
[ 263.596724][ C1] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 263.596727][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 263.596730][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 263.596733][ C1] ? run_timer_base (kernel/time/timer.c:2384 kernel/time/timer.c:2376 kernel/time/timer.c:2393) 
[ 263.596738][ C1] run_timer_base (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2393) 
[ 263.596741][ C1] run_timer_softirq (kernel/time/timer.c:2404) 
[ 263.596744][ C1] handle_softirqs (kernel/softirq.c:580) 
[ 263.596750][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 263.596753][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 263.596755][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  263.596759][    C1]  </IRQ>
[  263.596760][    C1]  <TASK>
[ 263.596762][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 263.596764][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 263.596768][ C1] Code: f2 ce 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 17 28 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	f2 ce                	repnz (bad)
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 83 17 28 00 	verw   0x281783(%rip)        # 0x2817ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	e9 fc 54 02 00       	jmp    0x25501
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[  263.596771][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000246
[  263.596774][    C1] RAX: 0000000000994603 RBX: 1ffff92000026fc1 RCX: ffffffff8ba125d9
[  263.596776][    C1] RDX: 0000000000000000 RSI: ffffffff8c6a61cd RDI: ffffffff8be58be0
[  263.596778][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c166fa
[  263.596780][    C1] R10: ffff8880360b37d3 R11: ffffffff8c811288 R12: 0000000000000000
[  263.596781][    C1] R13: ffff888001bf0040 R14: dffffc0000000000 R15: 0000000000000000
[ 263.596785][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 263.596790][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 263.596792][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 263.596794][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 263.596798][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 263.596802][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 263.596809][ C1] do_idle (kernel/sched/idle.c:325) 
[ 263.596812][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 263.596816][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 263.596819][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 263.596824][ C1] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [  263.615305][    C1] RCU nest depth: 0, expected: 0
| [  263.615594][    C1] INFO: lockdep is turned off.
| [  263.615772][    C1] Preemption disabled at:
| [ 263.615773][ C1] 0x0 
[  263.616085][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  263.616086][    C1] Call Trace:
[  263.616088][    C1]  <IRQ>
[ 263.616090][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 263.616097][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 263.616102][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 263.616106][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 263.616109][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 263.616113][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 263.616120][ C1] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 263.616125][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 263.616128][ C1] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 263.616130][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 263.616136][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 263.616139][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 263.616144][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 263.616147][ C1] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 263.616153][ C1] ? call_timer_fn (kernel/time/timer.c:1748) 
[ 263.616159][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 263.616162][ C1] ? handle_softirqs (kernel/softirq.c:580) 
[ 263.616167][ C1] ? __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 263.616171][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 263.616173][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 263.616177][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 263.616180][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 263.616184][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 263.616187][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 263.616189][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 263.616193][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 263.616196][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 263.616201][ C1] __put_net (net/core/net_namespace.c:732) 
[ 263.616205][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 263.616209][ C1] ? __pfx_tcp_write_timer (net/ipv4/tcp_timer.c:727) 
[ 263.616213][ C1] call_timer_fn (kernel/time/timer.c:1748) 
[ 263.616216][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1737) 
[ 263.616219][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1737) 
[ 263.616222][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1724) 
[ 263.616226][ C1] ? __run_timers (kernel/time/timer.c:1798 kernel/time/timer.c:2372) 
[ 263.616229][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 263.616234][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 263.616238][ C1] __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372) 
[ 263.616242][ C1] ? __pfx_tcp_write_timer (net/ipv4/tcp_timer.c:727) 
[ 263.616246][ C1] ? __pfx___run_timers (kernel/time/timer.c:2343) 
[ 263.616250][ C1] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 263.616253][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 263.616256][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 263.616259][ C1] ? run_timer_base (kernel/time/timer.c:2384 kernel/time/timer.c:2376 kernel/time/timer.c:2393) 
[ 263.616264][ C1] run_timer_base (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2393) 
[ 263.616268][ C1] run_timer_softirq (kernel/time/timer.c:2404) 
[ 263.616271][ C1] handle_softirqs (kernel/softirq.c:580) 
[ 263.616276][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 263.616280][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 263.616282][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[  263.616285][    C1]  </IRQ>
[  263.616286][    C1]  <TASK>
[ 263.616288][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 263.616290][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 263.616294][ C1] Code: f2 ce 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 17 28 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	f2 ce                	repnz (bad)
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 83 17 28 00 	verw   0x281783(%rip)        # 0x2817ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	e9 fc 54 02 00       	jmp    0x25501
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[  263.616296][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000246
[  263.616299][    C1] RAX: 0000000000994603 RBX: 1ffff92000026fc1 RCX: ffffffff8ba125d9
[  263.616301][    C1] RDX: 0000000000000000 RSI: ffffffff8c6a61cd RDI: ffffffff8be58be0
[  263.616303][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c166fa
[  263.616305][    C1] R10: ffff8880360b37d3 R11: ffffffff8c811288 R12: 0000000000000000
[  263.616306][    C1] R13: ffff888001bf0040 R14: dffffc0000000000 R15: 0000000000000000
[ 263.616310][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 263.616314][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 263.616317][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 263.616319][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 263.616323][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 263.616327][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 263.616333][ C1] do_idle (kernel/sched/idle.c:325) 
[ 263.616336][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 263.616340][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 263.616343][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit